could it be a flat spot in the cam???

 

Yea, piston slap noise will remain with the cylinder shorted unfortunately

 

so did i just wear out the skirt in my hard driving that day? i think this weekend i will drop the pan and check bearings. can i see the skirt at full drop on the crank for that piston?

 

You wont be able to see the skirt, you will be able to see any abnormal wear on the thrust surfaces on the cylinder walls. Cheapest way to go is get a low mileage used LQ4 put ARP rod bolts in, transfer your cam, heads, and new lifters and let her rip. Your gonna spend at least 1500 plus for forged pistons, new bearings, and machine work. Plus the down time. You can get a used motor for that.

 

one small problem. my new heads on a lq4 would be like 10:1+ scr which would suck for boost lol. other than that i agree. i'll do some searching and see what i can find. this blows!!!!!!

 

well, i put a bench press bar on the side of the motor and tap tap tapity. put the bar on the valve cover and head and nothing at all really quiet. put it back on the block and there it is. i put it on toward the back and its quiet...er but the front two are loud. so can i put some 10w30 and a bottle of lucas oil in there to get by for awhile?

 

I bet that it could make that noise for a while and not give you any problems but noise. I've had vehicles where piston slap is characteristic due to the wrist pin design. The ZZx crate motor knocked like crazy for over 80k that I owned it and never missed a beat. You could try a sligtly thicker weight oil, but I doubt it would make a difference, but maybe a 10w-30 is worth a shot.

 

hell, i need to change the oil anyway from the head swap. i still wonder if it was caused by the hard driving i did the day it started. my guess is the piston just swoll up enough (during long boost period) to wear a little and now it clacks around.

 

That sounds like it could be the cause...quick question, is the noise louder when it's cold?

 

when you first start it its loud as ****. then it quiets down after a few minutes. that's when its hard to hear, until you put a load on the motor